Tunable shock sensor with parallel dipole line trap system

Patent metadata

Field	Value
Publication number	US-10352797-B2
Application number	US-201715729403-A
Country	US
Kind code	B2
Filing date	Oct 10, 2017
Priority date	Oct 10, 2017
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

A tunable and resettable shock sensor using a parallel dipole line (PDL) trap system is provided. In one aspect, a shock sensor includes: a PDL trap having a pair of diametric magnets separated from one another by a gap g M , and a diamagnetic rod levitating in between the diametric magnets; and contact pads below the PDL trap, wherein the contact pads are separated from one another by a space that is less than a length l of the diamagnetic rod. A shock monitoring system is also provided that includes a network of the shock sensors, as is a method for shock monitoring using the shock sensors.

First claim

What is claimed is:

1. A shock sensor, comprising:
a parallel dipole line (PDL) trap having a pair of diametric magnets separated from one another by a gap g M which is variable, and a diamagnetic rod levitating in between the diametric magnets; and
electrically conductive contact pads below the PDL trap, wherein the electrically conductive contact pads are separated from one another by a space that is less than a length l of the diamagnetic rod such that when shock knocks the diamagnetic rod from the PDL trap the diamagnetic rod will connect the electrically conductive pads to one another forming a short between the electrically conductive pads,
wherein the diametric magnets are each affixed to a variable gap fixture configured to move the diametric magnets closer together or farther apart from one another to vary the gap g M and control a confinement potential of the PDL trap to thereby tune a shock threshold force above which is needed to knock the diamagnetic rod from the PDL trap.

2. The shock sensor of claim 1 , wherein two of the electrically conductive contact pads are present below a center of the PDL trap.

3. The shock sensor of claim 1 , wherein a pair of the electrically conductive contact pads is present below each end of the PDL trap.

4. The shock sensor of claim 1 , further comprising:
two other electrically conductive contact pads present above a center of the PDL trap.

5. A shock monitoring system, comprising:
a network of shock sensors, each of the shock sensors comprising: i) a PDL trap having a pair of diametric magnets separated from one another by a gap g M which is variable, and a diamagnetic rod levitating in between the diametric magnets, and ii) electrically conductive contact pads below the PDL trap, wherein the electrically conductive contact pads are separated from one another by a space that is less than a length l of the diamagnetic rod such that when shock knocks the diamagnetic rod from the PDL trap the diamagnetic rod will connect the electrically conductive pads to one another forming a short between the electrically conductive pads, wherein the diametric magnets are each affixed to a variable gap fixture configured to move the diametric magnets closer together or farther apart from one another to vary the gap g M and control a confinement potential of the PDL trap to thereby tune a shock threshold force above which is needed to knock the diamagnetic rod from the PDL trap; and
a blockchain ledger configured to record any shock-trigger events from the network of shock sensors.

6. The shock monitoring system of claim 5 , wherein the network of shock sensors is connected to a local area network.

7. The shock monitoring system of claim 6 , wherein the local area network is connected to the blockchain ledger via the Internet.

8. The shock monitoring system of claim 5 , wherein two of the electrically conductive contact pads are present below a center of the PDL trap.

9. The shock monitoring system of claim 5 , wherein a pair of the electrically conductive contact pads is present below each end of the PDL trap.

10. A method for shock monitoring, comprising the steps of:
providing at least one shock sensor comprising: i) a PDL trap having a pair of diametric magnets separated from one another by a gap g M which is variable, and a diamagnetic rod levitating in between the diametric magnets, and ii) electrically conductive contact pads below the PDL trap, wherein the electrically conductive contact pads are separated from one another by a space that is less than a length l of the diamagnetic rod such that when shock knocks the diamagnetic rod from the PDL trap the diamagnetic rod will connect the electrically conductive pads to one another forming a short between the electrically conductive pads, wherein the diametric magnets are each affixed to a variable gap fixture configured to vary the gap g M between the diametric magnets;
varying the gap g M by using the variable gap fixture to move the diametric magnets closer together or farther apart from one another to control a confinement potential of the PDL trap and thereby tune a shock threshold force of the at least one shock sensor above which is needed to knock the diamagnetic rod from the PDL trap;
placing the at least one shock sensor that has been tuned with a product; and
monitoring a state of the at least one shock sensor.

11. The method of claim 10 , further comprising the step of:
determining whether a shock-trigger event has occurred, wherein the shock trigger event exceeds the shock threshold force of the at least one shock sensor and causes the diamagnetic rod to fall from the PDL trap onto and shorting the at least two electrically conductive contact pads.

12. The method of claim 11 , further comprising the step of:
monitoring a resistance between the electrically conductive contact pads.

13. The method of claim 11 , wherein a shock-trigger event has occurred, the method further comprising the step of:
recording the shock-trigger event in a blockchain ledger.

14. The method of claim 13 , further comprising the steps of:
resetting the at least one shock sensor; and
continue monitoring the state of the at least one shock sensor.

15. The method of claim 14 , wherein the at least one shock sensor further comprises two other electrically conductive contact pads present above a center of the PDL trap.

16. The method of claim 15 , wherein the step of resetting the at least one shock sensor comprises the step of:
flipping the at least one shock sensor.

Assignees

• IBM

Inventors

• Gunawan Oki
• Sosa Norma E

Classifications

• G01L1/12

  by measuring variations in the magnetic properties of materials resulting from the application of stress · CPC title

• G01P15/0891

  with indication of predetermined acceleration values (G01P15/135 takes precedence) · CPC title

• H04L9/3239

  involving non-keyed hash functions, e.g. modification detection codes [MDCs], MD5, SHA or RIPEMD · CPC title

• H02N15/00

  Holding or levitation devices using magnetic attraction or repulsion, not otherwise provided for (electric or magnetic devices for holding work on machine tools B23Q3/15 {; monorail vehicle propulsion or suspension B60L13/00}; sliding or levitation devices for railway systems B61B13/08; material handling devices associated with conveyors incorporating devices with electrostatic or magnetic grippers B65G47/92; separating thin or filamentary articles from piles using magnetic force B65H3/16; delivering thin or filamentary articles from magnetic holders by air blast or suction B65H29/24; bearings using magnetic or electric supporting means F16C32/04; relieving bearing loads using magnetic means F16C39/06; magnets H01F7/00; dynamo-electric clutches or brakes H02K49/00 {; electric furnaces with simultaneous levitation and heating H05B6/32}) · CPC title

• H01H35/14

  Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch {(wherein the liquid constitutes a contact of the switch H01H29/002)} · CPC title